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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e7530385d18d54f94cc52cb8af83d8fb445fb1576c640eadb852e2a1084dd1' 
  AND token = 'rnlwFfLKp+An89wtK0waWvXfrB92qfscaMgLb1qT2uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}